Dust-collector



(No Model.)

H. L. DAY. DUST UOLLBGTOR. No. 476,524. Patentgjuxe '7, 1892.

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HENRY L. DAY, OF MINNEAPOLIS, MINNESOTA.

DUST-COLLECTOR.

SPECFICATION forming part of Letters Patent NO. 476,524, dated June 7,1892.

Application filed June 3, 1891. Serial No. 3945951. (No model.)

To all whom t may concern:

Be itknown that l, HENRY L. DAY, a citizen of the United Stat-es,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented-certain new and useful Improvements inDust-Collectors; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to dust-collectors of that sub-class wherein theseparation is effected by momentum, and has for its object to provide amore efficient and cheaper construction for the purpose.

To this end the invention consists in certain novel points ofconstruction and arrangement of the parts, which will be hereinafterfully described, and particularlypointed out in the claims.

A dust-collector constructed in accordance with my invention isillustrated in the accompanying drawings, wherein, like lettersreferring to like parts throughout- Figure l is a side elevation of thedevice. Fig. 2 is a vertical section of the same in a plane near themouth of the delivery-section of the inlet spout on the line X X of Fig.3. Fig. 3 is a plan view of the device, and Fig. et is ahorizontalsection on the line YY of Fig. l.

A B C are the collecting-chambers, of which A is the central orcylindrical section, B the conical or bottom section, and C thesupplementary chamber or dust-cap at the top. The central chamber A isrelatively large and is provided with the centrally-located clean-airdischarge a atits top. The conical section B is secured to the bottom ofthe section A and is provided with the ordinary dust-discharge b. Thesupplementary chamber C is mounted on the top of the main chambersurrounding the clean-air discharge a, and is itself provided in its topwith a centrally-located cleanair discharge c. The chamber C has in oneof its vertical walls a slot provided with an inwardly-projecting lip(l, forming a tangential dust-discharge D, which is covered by adischarge-tube D', directing away whatever dust may be discharged fromthe chamber C. This supplementary chamber C and its ccnnecting parts isonly employed when it is desired to carry the separation to the utmostdegree of refinement. it is not required.

E E is my inlet-spout for introducing the dust-laden air, of which partsE is the entrance-section and E the delivery-section of the said spout.The section E or inlet proper enters the collecting-chamber A, parallelwith the axis of the said chamber, while the section E is of a curved orspiral form and may be either formed integral with the section E orseparate therefrom and secured within the chamber A. Preferably thedelivery-section spreads in the vertical direction and narrows orcontracts in the radial direction of the chamber to give an elongateddischargemouth e of the same area as the body of the spout, or largerthan same. This form of discharge-month is of importance for a certainpurpose, as will presently appear. rlhis axial entrance or entranceparallel with the axis of the collecting-chamber, in co-cperation with acurved or spirally-arranged deliverysection for the inlet-spout, is theimportant feature of my invention. The delivery-section is of lessextent than a complete circle. This fact is also of importance inrespect to its function. The eifect of this arrangement of the inlet anddischarge section of the inlet-spout is a very considerable separationWithin the inlet-spout itself and the delivery of the dust from thebottom of the dischargesection of the saidspout at a point nearest tothe dust-discharge of the collecting-chamber and the delive-ry of theseparated or clean air from the top of the discharge-mouth of the saidsection at a point nearest to the clean-air discharge. In other words, alarge part of the separation is eected at once at the change ofdirection from the section E to the section Eof the inlet-spout, causingmost of the dust to be immediately precipitated to the bottom of thedelivery-section and be discharged therefrom and permitting the cleanair or a large part of the same to immediately escape through theclean-air discharge a. The fact that the delivery-section is less than acomplete circle causes the dust to be delivered directly from the bottomplate of the same before it can be gathered up and thrown against theouter wall of the same under the whirling motion ot' the air. it thisdelivery- For ordinary purposes section made a complete turn or wasequal to IOO or greater than a complete circle the dust would be thrownto the outer wall of the same and delivered therefrom onto the peripheryof the cylinder A and Would be spread over the Whole surface of the sameunder the whirling motion of the dust-ladenrair. In

' other Words, the peculiar form and relation Y discharge.

of the sections E and E of the inlet-spout both secures and preservesthe separation between the air and the dust, permitting the former to beconducted directly to the airdischarge and the latter directly to thedust- VThis has two veryimporta-nt results, to Wit: It greatly lessensthe amount of separation or Work to be performed in the chambers A andB, and, second, enables the separation effected in the said chambers tobe carried to a much greater degree, so that when the air escapesthrough the discharge a it Will be sufficiently clean for all practicalpurposes. In other Words, my form of inlet and discharge section enablesthe necessary separation to be effected with a minimumV amount ofseparating-surface. So long as this form of inlet and discharge sectionis preserved it is immaterial what form or shape is given to the chamberA.V The said chamber may be of any shape which will permit the whirlingmotion of the air. The dustdischarge, however, from the said chambershould always be at some point nearest to the bottom ofthedischarge-mouth e, and the clean-air discharge a should always be atsome point nearest to the top of the said discharge-mouth. These pointsbeing preserved, the conical section B might be entirely omitted byequipping the cylinder A with a bottom having a dust-discharge at anypoint therein, but preferably at some point near its junction With theside Walls of the said chamber7 or the dust-discharge might be in theside of the cylinder A.

It is of course understood that the dust* laden air is introducedthrough the spout E E under a high pressure in the customary way.

So far as effecting the partial separation Within the delivery-sectionis concerned, the discharge-mouth of the said section might be eitherround or square in cross-section, so long as the said section was lessthan a complete circle; but such a form of discharge-mouth would notdeliver the air and dust at such remote points from each other. In otherWords, the elongation of the 'said dischargemouth in the axial directionand its contraction in the radial direction enables the clean air to beVdelivered therefrom nearer to the air-discharge from the chamber A andthe dust nearer to the dust-discharge of the said chamber.

As before stated, I have found by actual practice that I do not need toemploy a supplementary cylinder C and its immediately connected parts,though if it is employed the separation Will of course be carried to astill higher degree of perfection, removing the last and finestparticlesof dust.

IVhat I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

Vl. In a d ust-collector, the combinatiomwith a collecting-chamber, ofan inletspout for the dust-laden air, having its body arranged to enterthe said chamber parallel with the chambers axis, and a curved or spiraldelivery-section for said inlet-spout Within the saidcollecting-chamber, substantially as described.

2. In a d ust-collector, the combinatiomwith a collecting-chamber, of aninlet-spout entering the chamber parallel with the axis'of the same, anda curved or spirally-arranged de liveiysection for the dust-laden airWithin the said chamber spread out or extended in the axial directionand contracted in the radial direction with reference to said chamber,substantially as and for the purpose set forth.

3. In a dust-collector, the co1nbination,\vith a collecting-chamber, ofan inlet-spout forthe dust-laden air, havin g its bodyarranged to enterthe said chamber parallel with the axis of the chamber and provided Witha curved or spiral delivery-section Withinthe said chamber of lessextent than a complete circle, substantially as and for the purpose setforth.

4. In a d ust-collector, the combination,with a collectingchamberprovided with a cleanair discharge at its receiving end and adustdischarge at its delivery end or side, of an inlet-spout for thedust-laden air entering the receiving end of the said chamber parallelwith the axis of the same and provided with a curved or spiraldischarge-section of less extent than a complete circle and terminatingin a discharge-mouth,whicl1 is extended in the axial direction andcontracted in the radial direction with reference to said chamber,substantially as and for the purpose set forth.

In testimony whereof Iaflix my signature in presence of two Witnesses.

HENRY L. DAY,

Witnesses:

Jas. F. WILLIAMsoN, E. F. ELMORE.

IUC

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